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Acquisitions - Pro Forma Result of Comparable Prior Reporting Period (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Business Acquisition [Line Items] |  |  |  |
Net Interest Income | $ 43,463 | $ 41,673 | $ 127,174 | $ 123,358
Provision for loan losses | 376 | 1,176 | 1,936 | 3,178
Net Interest Income after Provision for Loan Losses | 43,087 | 40,497 | 125,238 | 120,180
Non-interest Income | 11,514 | 10,600 | 31,538 | 31,441
Non-interest Expense | 30,060 | 32,978 | 103,796 | 98,557
Income before Income Taxes | 24,541 | 18,119 | 52,980 | 53,064
Income Tax Expense | 4,004 | 2,540 | 9,326 | 7,738
Net Income | 20,537 | 15,579 | 43,654 | 45,326
Net Income Available to Common Shareholders | $ 20,537 | $ 15,579 | $ 43,654 | $ 45,326
Basic Earnings Per Share | $ 0.46 | $ 0.41 | $ 0.97 | $ 1.18
Diluted Earnings Per Share | $ 0.46 | $ 0.40 | $ 0.97 | $ 1.18

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